Bioreactor Perfusion Control Using Weight Feedback and Periodic Pumping
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Solution Overview
Problem
Traditional bioreactors face issues with filter clogging and increased power consumption due to continuous perfusion processes, leading to reduced output, equipment downtime, and reduced motor life, without considering the stage of biological development within the reactor.
Innovation Solution
A perfusion control system using a media container with a weighing scale and controllers to manage media and permeate flow based on bioreactor weight, maintaining a user-defined weight range to optimize media feed and permeate pump operation, thereby reducing filter clogging and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous perfusion is performed to improve cell culture yield, then productivity is improved, but filter clogging occurs leading to reduced output and increased downtime
Solution Approach 1:
The system switches from continuous perfusion to periodic batch feeding, where the bioreactor operates in cycles of feeding and incubation. This periodic operation reduces continuous media flow through the filter, preventing cell deposition and clogging while still achieving high productivity over time through multiple feeding cycles.
2Productivity
If motor pump speed is increased to maintain permeate flow rate during filter clogging, then permeate output is maintained, but power consumption increases and motor life reduces
Solution Approach 1:
By operating in periodic batches rather than continuously, the pump runs intermittently rather than at high speed continuously. This reduces cumulative power consumption and motor wear while maintaining overall permeate output through optimized feeding cycles.
Solution Approach 2:
The system performs feeding actions in advance during specific time windows rather than continuously, allowing the filter to process media in controlled bursts. This preliminary concentrated feeding reduces the need for continuous high-speed pumping to maintain permeate flow.
3Reliability
If filter is cleaned timely to maintain filter performance, then reliability is improved, but downtime of bioreactor increases
Solution Approach 1:
The periodic batch operation inherently prevents severe clogging by interrupting continuous flow, allowing the filter to be cleaned less frequently. The natural cycling of the process provides recovery time for the filter between cleaning intervals, reducing overall downtime.
4Ease of operation
If volume-based perfusion control is used to simplify operation, then ease of operation is improved, but filter clogging and power consumption increase
Solution Approach 1:
The system uses weight sensors to provide real-time feedback on bioreactor mass, which directly reflects media consumption and cell growth. This feedback enables automated adjustment of feeding rates to match actual biological needs, preventing over-feeding that would cause filter clogging while maintaining simple operation through automated control.
Solution Approach 2:
The system transitions from volume-based control to weight-based control, using mass as the key parameter. This parameter change provides more accurate monitoring of actual bioreactor contents and enables precise control of media addition rates, preventing filter overload while maintaining operational simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This system maintains consistent perfusion rates, improves filter performance, reduces power consumption, and extends motor pump life by intermittently operating the permeate pump, ensuring steady-state bioreactor conditions and better product quality.
Implementation Method 1
A weighing scale is provided to measure the weight of the bioreactor
Data Source
AI summary
Systems and methods for perfusion control in a bioreactor are provided. The system comprises a media container connected to the bioreactor and weighing scales measure weight of the bioreactor and the media container. Controllers are connected to the weighing scales and configured to continuously feed the media from a media container to the bioreactor at a user defined rate using a motor pump. A filter is provided to receive feed from the bioreactor through a recirculation line and a permeate flow line is connected to the filter to flow out the permeate from the filter. When weight of the bioreactor goes beyond the upper (U) or lower (L) permissible weight limit, a controller connected to the weighing scale of the bioreactor sends a signal to operate the permeate motor pump either to flow out the permeate from the filter or to stop the motor pump.